[FIR] Fix Disappeared INVALID_CHARACTERS

^KT-59996 Fixed

compiler/testData/diagnostics/testsWithJsStdLib/name/legalPackageName.kt

@@ -0,0 +1,30 @@
+// FIR_IDENTICAL
+// !LANGUAGE: +JsAllowInvalidCharsIdentifiersEscaping
+
+// FILE: slashes.kt
+package a.`//`.b.`/`.c
+class Slashes
+
+// FILE: slash.kt
+package `/`
+class Slash
+
+// FILE: space.kt
+package ` `
+class Space
+
+// FILE: less.kt
+package `<`
+class Less
+
+// FILE: more.kt
+package `>`
+class More
+
+// FILE: dash.kt
+package `-`
+class Dash
+
+// FILE: question.kt
+package `?`
+class Question